参数资料
型号: XRT83L38IB-F
厂商: Exar Corporation
文件页数: 29/87页
文件大小: 0K
描述: IC LIU T1/E1/J1 OCTAL 225BGA
标准包装: 84
类型: 线路接口装置(LIU)
驱动器/接收器数: 8/8
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 225-BGA
供应商设备封装: 225-BGA(19x19)
包装: 托盘
XRT83L38
32
REV. 1.0.2
OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
In Hardware mode, RXTSEL (Pin 83) can be tied “High” to select internal termination mode for all receive
channels or tied “Low” to select external termination mode. Individual channel control can only be done in Host
mode. By default the XRT83L38 is set for external termination mode at power up or at Hardware reset.
In Host mode, bit 7 in the appropriate channel register, (Table 20, “Microprocessor Register #1, Bit
Description,” on page 51), is set “High” to select the internal termination mode for that specific receive
channel.
If the internal termination mode (RXTSEL = “1”) is selected, the effective impedance for E1, T1 or J1 can be
achieved either with an internal resistor or a combination of internal and external resistors as shown in Table 7.
NOTE: In Hardware mode, pins RXRES[1:0] control all channels.
TABLE 6: RECEIVE TERMINATION CONTROL
RXTSEL
RX TERMINATION
0
EXTERNAL
1
INTERNAL
FIGURE 13. SIMPLIFIED DIAGRAM FOR THE INTERNAL RECEIVE AND TRANSMIT TERMINATION MODE
TABLE 7: RECEIVE TERMINATIONS
RXTSEL
TERSEL1
TERSEL0
RXRES1
RXRES0
Rext
Rint
MODE
0
x
Rext
T1/E1/J1
1
0
100
Ω
T1
1
0
1
0
110
Ω
J1
1
0
75
Ω
E1
T1
TTIP
TRING
5
8
1:2
75
Ω , 100 Ω
110
Ω or 120 Ω
4
1
0.68
μ F
R
int
R
int
TTIP
TRIN G
TX
Line Driver
T2
RTIP
RR ING
1
4
1:1
8
5
RTIP
RRING
RX
Equalizer
R
int
Channel _n
TPOS
TNEG
TCLK
RPO S
RNEG
RCLK
75
Ω , 100 Ω
110
Ω or 120 Ω
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